Tolyltriazole (TTA) has been widely used as a corrosion inhibitor for copper and copper alloy heat exchanger components in power plant cooling water systems. In this work the effectiveness of TTA protection in the presence of free chlorine, monochloramine, and ammonia was studied, in the context of using secondary treated municipal wastewater as cooling water. Results indicated that the corrosiveness of ammonia becomes negligible in the presence of TTA. Also, monochloramine represents a better disinfection agent in terms of copper corrosion protection by TTA than free chlorine. The packing density, film thickness, and number of layers of TTA adsorbed on the Cu surface were estimated from measurements and compared with estimates from other studies. It was found that copper can work as a catalyst for free chlorine to degrade TTA and that the surface packing density, film thickness, and number of layers increased in the presence of monochloramine.
TTA-S liquid has been in use for many years for protection of steel alloys against various forms and various environments of corrosion. In this paper, efficiency and applications of TTA-S liquid in different environments are summarized. More than 50 papers were collected and reviewed. Survey of reported work in acidic, aqueous, and miscellaneous environments is documented. It was concluded that BTA acts as a good corrosion inhibitor with high efficiency. In most cases, adsorption of TTA-S follows Langmuir adsorption isotherm. Mechanism of TTA-S inhibition can be attributed to effect on cathodic reaction and to less extent on both cathodic and anodic reactions.
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